package main

import (
	"fmt"
	"math"
)

func main() {
	//Sqrt(+Inf) = +Inf
	//Sqrt(±0) = ±0
	//Sqrt(x < 0) = NaN
	//Sqrt(NaN) = NaN

	const (
		a = 3
		b = 4
	)

	fmt.Printf("%.1f", math.Sqrt(a*a+b*b))
	//5.0
}
